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authorLi Zefan <lizf@cn.fujitsu.com>2010-04-22 22:35:52 -0400
committerPaul E. McKenney <paulmck@linux.vnet.ibm.com>2010-05-04 12:25:02 -0400
commit1ce7e4ff24fe338438bc7837e02780f202bf202b (patch)
tree3906643ba96ba8b3fda2291e5e40e48bbba9085f /include/linux/cgroup.h
parentb629317e66fb1c6066c550dded45ab85a936163c (diff)
cgroup: Check task_lock in task_subsys_state()
Expand task_subsys_state()'s rcu_dereference_check() to include the full locking rule as documented in Documentation/cgroups/cgroups.txt by adding a check for task->alloc_lock being held. This fixes an RCU false positive when resuming from suspend. The warning comes from freezer cgroup in cgroup_freezing_or_frozen(). Signed-off-by: Li Zefan <lizf@cn.fujitsu.com> Acked-by: Matt Helsley <matthltc@us.ibm.com> Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Diffstat (limited to 'include/linux/cgroup.h')
-rw-r--r--include/linux/cgroup.h1
1 files changed, 1 insertions, 0 deletions
diff --git a/include/linux/cgroup.h b/include/linux/cgroup.h
index b8ad1ea99586..8f78073d7caa 100644
--- a/include/linux/cgroup.h
+++ b/include/linux/cgroup.h
@@ -530,6 +530,7 @@ static inline struct cgroup_subsys_state *task_subsys_state(
530{ 530{
531 return rcu_dereference_check(task->cgroups->subsys[subsys_id], 531 return rcu_dereference_check(task->cgroups->subsys[subsys_id],
532 rcu_read_lock_held() || 532 rcu_read_lock_held() ||
533 lockdep_is_held(&task->alloc_lock) ||
533 cgroup_lock_is_held()); 534 cgroup_lock_is_held());
534} 535}
535 536